Add node alias to config file

[Anyitechs]

Now that we added announcement_addresses to Config/config file, attempting to start the server without configuring a node alias results in a build error.

[ldk-reviews-bot]

I've assigned @benthecarman as a reviewer!
I'll wait for their review and will help manage the review process.
Once they submit their review, I'll check if a second reviewer would be helpful.